[TASK] bump version to 19.1.0

package.json

 {
-  "name": "@ckeditor/ckeditor5-build-decoupled-document",
-  "version": "19.0.0",
-  "description": "The document editor build of CKEditor 5 – the best browser-based rich text editor.",
+  "name": "@dkaufmann/ckeditor5-build-decoupled-custom-document",
+  "version": "19.1.0",
+  "description": "A build of CKEditor 5 including two custom plugins.",
   "keywords": [
     "ckeditor5-build",
     "ckeditor",